Kind of interesting.
There's a song by Tim Ryan, I think, titled "Say Goodbye to Montana." It's a very pretty song and several other cowboy music types have picked it up, and I sing it myself. It's obviously derived from McMurty's "Lonesome Dove," but that's so obvious that it's tribute, not stealing.
Anyway, the last verse goes:
All honor to the Cowboy, his praises we'll sing, 'Cause you never sold your saddle, and that's the most important thing.
I wonder if Ryan heard the song of which you enquire at some point, or if it's coincidence...